TH5110D
5 69-1713—01
Troubleshooting Tips
If . . . Then . . .
Display is blank. • Check circuit breaker to be sure it is not tripped.
• Check power switch at heating and/or cooling system to be sure it is on.
• Check furnace door to be sure it is closed securely.
• If you use batteries, check that fresh AAA alkaline batteries are installed as marked on
the battery holder.
Temperature settings
do not change.
Check that the temperature settings are:
• Heating 40°F to 90°F (4.5°C to 32°C).
• Cooling 50°F to 99° F (10°C to 37°C).
Heating system does
not turn on.
• Set the system to Heat by pressing the System button.
• Check that the heat temperature setting is set above the room temperature and “Heat
On” shows solidly in the display.
• Check the circuit breaker to be sure it is not tripped.
• Check power switch at the heating and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is closed securely.
• Wait five minutes for the heating system to respond.
• If all of this was checked, contact your local heating and cooling contractor.
Cooling system does
not turn on.
• Set the system to Cool by pressing the System button.
• Check the cool temperature setting to be sure it is set below room temperature and
“Cool On” shows solidly in the display.
• Check the circuit breaker to be sure it is not tripped.
• Check the power switch at the heating and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is closed securely.
• Wait five minutes for the cooling system to respond.
• If all of this was checked, contact your local heating and cooling contractor.
“Heat On” is not shown
in the display.
Set System setting to Heat and set the temperature setting above the room temperature.
If “Heat On” is shown solidly in the display, but the heating system does not turn on, see
“Heating system does not turn on” in Troubleshooting Tips.
“Cool On” is not shown
in the display.
Set System setting to Cool and set the temperature setting below the room temperature. If
“Cool On” is shown solidly in the display, but the cooling system does not turn on, see
“Cooling system does not turn on” in Troubleshooting Tips.
“Heat On” is flashing
in the display (heat
pumps only).
Compressor minimum-off timer is active. Wait up to five minutes for the heating system
to turn on.
“Cool On” is flashing in
the display.
Compressor minimum-off timer is active. Wait up to five minutes for the cooling system
to turn on.
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